follow up:
I've used this for a few hours now. It's pretty cool in its restricted-domain search function. By loading the feeds of Library Clips and Cleverclogs, I've got an ultra-curated (gatekeepers rule!) yet widely inclusive set of sources about RSS/OPML. The only problem I have with Lijit is that it is possible/easy to confuse a tag for a page vs subdomain vs domain. Thus, one effect of this is that the search annotation I receive via Lijit about *any* blog hosted by blogspot is a comment that is in actuality specific to only one blog (subdomain); that is, my fellow Lijit-er tagged the entire blogspot domain with an observation relevant only to one particular and topic-specific subdomain. In isolation and as a single example, it's no trouble at all. However, en masse it could be problematic in creating noise rather than signal.